Changes

==Thuban as a Pole Star==

==Thuban as a Pole Star==

Thuban was the pole star, meaning the closest star to the celestial north pole that can be seen with the unaided eye.  Due to the [[precession of the equinoxes]], Thuban was the pole star from around 3900 BC until 1900  BC, when the much brighter [[Beta Ursae Minoris]] replaced it (Although Thuban was still closer to the celestial pole until 1793 BC).<ref>http://www.daviddarling.info/encyclopedia/T/Thuban.html</ref>  At present, Thuban is slowly moving away from the northern celestial pole, and will continue to do so until around 10,000 AD, when it will again move towards the pole.  Thuban will become the pole star once again in 20,346 AD.

Thuban was the pole star, meaning the closest star to the celestial north pole that can be seen with the unaided eye.  Due to the [[precession of the equinoxes]], Thuban was the pole star from around 3900 BC until 1900  BC, when the much brighter [[Beta Ursae Minoris]] replaced it (Although Thuban was still closer to the celestial pole until 1793 BC).<ref>http://www.daviddarling.info/encyclopedia/T/Thuban.html</ref>  At present, Thuban is slowly moving away from the northern celestial pole.

[[Category:Astronomy]]

[[Category:Astronomy]]